Revert "Remove Expect from core library."

tests/standalone/typed_data_test.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 //
 // Dart test program for testing typed data.
 
 // Library tag to be able to run in html test framework.
 library TypedDataTest;
 
-import "package:expect/expect.dart";
 import 'dart:typeddata';
 
 void testCreateUint8TypedData() {
   Uint8List typed_data;
 
   typed_data = new Uint8List(0);
   Expect.isTrue(typed_data is Uint8List);
   Expect.isFalse(typed_data is Uint8ClampedList);
   Expect.equals(0, typed_data.length);
 
@@ skipping 210 matching lines @@
     testExternalClampedUnsignedTypedDataRange(false);
     testSetRange();
     testIndexOutOfRange();
     testIndexOf();
   }
   testTypedDataRange(true);
   testUnsignedTypedDataRange(true);
   testExternalClampedUnsignedTypedDataRange(true);
 }